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When I play tennis for an extended period of time my big toe starts to ache and the next day my knee has pain and the outside of it gets liquid and is swollen. The pain originates on the inside but liquid or swell is on the outside? Last maybe one week then back to normal
Make sure you are running and cutting with your feet forwards and not turned out like a duck. That produces a bad force through the big toe and through the knee as well.